Excerpt from http://hiddensandiego.net/rum-runners-cave.php : "... Rum Runners from Mexico would navigate their dinghies up the little tunnel to a small underground elevator. This is a story I heard from my Grandparents and Uncles (who relocated to Ocean Beach after the war.) The tunnels are said to be all blocked off these days."
Recently, the boulder blocking the entrance to the cave was removed. To enter the cave you crawl into the manhole like rock crevice which anxiously hugs you as you slide down into pitch blackness. Then the small tunnel opens into the larger caves.
Shots down below courtesy of RussDudda (he stay be gettin the shots)